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Lewis was born in West Chester, Pennsylvania to Joseph J. and Mary (Miner) Lewis. He graduated from Yale in 1853 with an A.B., and after studying with a view to entering the ministry, served as professor at the State Normal University at Bloomington, Illinois, 1856–57, and from 1858 to 1861 was professor in Troy University.[2] In 1863-64 he was a United States deputy commissioner of internal revenue.[3] He received a doctorate from NYU in 1877.[4]